It is effective because it uses fair and unbiased logic to present a flaw in the counterclaim.
Explanation: a rebuttal is someone who down not support an opposite party. He does not agree with the other person on a particular subject. It is often used during debates.
A rebuttal gives good and logical reasons why he or she does not agree with the opposing party. A rebuttal explain in details while he needs to be heard over the opposing party.